but it has a little protein on it, that makes the lemons taste as sweet as lemonade. let me give you a demonstration here. >> it's safe and healthy, right? >> it's completely safe. right here, what i want you to do is take that lemon and squeeze it into your seltzer water. this is just seltzer water. throw two in there. >> i like lemon water. i can make it really sour. that's probably really sour. >> give that a sip. you know, what does it taste like? >> lemon water. i like it. but it's good. very sour. >> i need you to take this powder and put it on your tongue. >> hold it on my tongue? >> yep. right now, that little protein in the berry is latching on to your sour taste receptors and it's going to block it. sour foods will taste sweet. you can support us with the kick-starter campaign. when you dive right back into that soda water, it's going to taste as sweet as lemonade, void of sugar. >> uh-huh. >> and typically -- and so, we're actually going to try all these other desserts after this, which use sour things to replace sugar. >> okay. here i go. okay. it does tas